12 lines
385 B
Ruby
12 lines
385 B
Ruby
class AddLastPostedAtToUsers < ActiveRecord::Migration
|
|
def change
|
|
add_column :users, :last_posted_at, :datetime, null: true
|
|
add_index :users, :last_posted_at
|
|
|
|
execute "UPDATE users
|
|
SET last_posted_at = (SELECT MAX(posts.created_at)
|
|
FROM posts
|
|
WHERE posts.user_id = users.id)"
|
|
end
|
|
end
|